The Ammo Regen power-up is the perfect complement to
the Prox Launcher use it to sow mine fields in areas
you know your opponents will be headed. Try to place
those mines in hard-to-spot locations, such as on walls
or doorways, so the intended victim won't see them in
advance and detonate them with a rocket. Be sure to bind keys to critical team commands so you
won't have to hit Esc and issue orders from the menu.
This saves you much time and allows you to keep moving
while communicating with teammates. Most of the time you'll want someone who's guarding your
base to grab the Doubler power-up, but you should let
your offense use it in the Overload game mode so they
won't have to spend as long firing at the enemy's obelisk
to destroy it.